25 February 1993 Optical and thermal responses of a cryogenically cooled beryllium mirror to pulsed laser irradiation
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Abstract
Experiments were performed to investigate the optical and thermal responses of a cryogenically cooled beryllium mirror to pulsed laser irradiation. The mirror has flow channels on its backside for rapid cooling using liquid nitrogen and solidifying argon. The tests were carried out at solid argon temperatures. Laser fluence levels up to 18.5 kW/cm2 were incident on the mirror. The optical distortion of the front surface of the mirror was monitored with an interferometer. The thermal response of the mirror was measured using a platinum resistance thermometer and a differential thermocouple on the back of the mirror. The surface distortion due to laser irradiation and the recovery of the mirror to its undistorted figure are described.
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Bruce A. Watson, Bruce A. Watson, Ike C. Hsu, Ike C. Hsu, Neal T. Nomiyama, Neal T. Nomiyama, } "Optical and thermal responses of a cryogenically cooled beryllium mirror to pulsed laser irradiation", Proc. SPIE 1739, High Heat Flux Engineering, (25 February 1993); doi: 10.1117/12.140506; https://doi.org/10.1117/12.140506
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